EP1708182A2 - Enregistreur d'hologrammes - Google Patents

Enregistreur d'hologrammes Download PDF

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Publication number
EP1708182A2
EP1708182A2 EP06250996A EP06250996A EP1708182A2 EP 1708182 A2 EP1708182 A2 EP 1708182A2 EP 06250996 A EP06250996 A EP 06250996A EP 06250996 A EP06250996 A EP 06250996A EP 1708182 A2 EP1708182 A2 EP 1708182A2
Authority
EP
European Patent Office
Prior art keywords
recording
hologram
light modulator
spatial light
recording beam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06250996A
Other languages
German (de)
English (en)
Other versions
EP1708182A3 (fr
Inventor
Hiroyasu c/o Fujitsu Limited Yoshikawa
Kouichi c/o Fujitsu Limited Tezuka
Kazushi c/o Fujitsu Limited Uno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP1708182A2 publication Critical patent/EP1708182A2/fr
Publication of EP1708182A3 publication Critical patent/EP1708182A3/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/018—Input/output arrangements for oriental characters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
    • G06F3/0233—Character input methods
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/128—Modulators
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1367—Stepped phase plates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
    • G03H1/265—Angle multiplexing; Multichannel holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/13—Phase mask
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00—Active addressable light modulator
    • G03H2225/55—Having optical element registered to each pixel
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms

Definitions

  • the present invention relates to hologram recorders for recording holograms in a hologram recording medium.
  • a conventional hologram recorder is disclosed in JP-A-2002-216359 , for example.
  • Hologram recorders of this kind have a basic configuration as shown in Fig. 4. Specifically, a laser beam which comes out of a laser beam source (not illustrated) is split into a recording beam S and a reference beam R. The recording beam S is then modulated by a spatial light modulator 500A into a form representing the information to be recorded, then passes through relay lenses 700A, 700B and then through an objective lens 700, before it reaches a recording layer 91 of a hologram recording medium B.
  • the reference beam R is directed by a recording galvanometer mirror 900 and condenser lenses 100A, 100B to the hologram recording medium B, and interferes with the recording beam S in the recording layer 91 of the hologram recording medium B.
  • a hologram is recorded in the recording layer 91 in the form of interference fringes caused by the recording beam S and the reference beam R.
  • the amount of data (record amount) recorded in such a hologram depends on the number of effective pixels in the spatial light modulator.
  • the number of effective pixels is proportional to the size of overall pixel region if the pixel pitch is constant whereas the number of effective pixels is proportional to an inverse number of the pixel pitch if the size of overall pixel region is constant. Therefore, in order to increase the amount of data to be recorded, simply, the size of overall pixel region should be increased without changing the pixel pitch of the spatial light modulator or the pixel pitch should be decreased without changing the size of overall pixel region, so as to increase the number of effective pixels in the spatial light modulator.
  • a relay lens 700A' which is closer to the spatial light modulator 500B must have a larger aperture and a longer focal distance.
  • ⁇ 1-order diffractions D1 appear on the Fourier plane F, at locations away from the optical axis by a distance T.
  • the distance T is greater than the distance t in Fig. 4, which means that the objective lens 700' must be given a larger effective aperture by optical design.
  • the pixel pitch is decreased without changing the size of the entire pixel region of the spatial light modulator, whereby the number of effective pixels with respect to the recording beam is increased as compared to the case in Fig. 4.
  • a result is an increased distance between the optical axis and ⁇ 1-order diffractions because the diffraction angle on the exiting surface of the spatial light modulator increases with the pixel pitch.
  • the objective lens effective aperture must be increased even more.
  • the number of effective pixels in the spatial light modulator must be increased and the objective lens must have superior optical characteristics in order to further increase the amount of recording in a hologram.
  • a hologram recorder capable of increasing the amount of recording in a hologram easily, without relying upon superior optical characteristics of the optical system.
  • a hologram recorder embodying the present invention which records a hologram in a hologram recording medium by interference of a recording beam with a reference beam in the hologram recording medium, includes: a light source which outputs coherent light to be split into the recording beam and the reference beam; a spatial light modulator which modulates the recording beam into a form representing information to be recorded; and an objective lens which outputs the recording beam.
  • the spatial light modulator has a light entering surface provided with a phase shift mask which allows the recording beam to pass through while partially shifting a phase of the recording beam passing through the mask.
  • the phase shift mask includes first transparent pixels which simply allow the recording beam to pass through, and second transparent pixels which give the recording beam a phase difference n. Further, the first transparent pixels and the second transparent pixels are alternated with each other in an array.
  • the hologram recorder further includes a relay lens provided between the spatial light modulator and the objective lens.
  • the hologram recorder further includes an aperture provided in an optical path for propagation of a frequency which is half a Nyquist spatial frequency of the spatial light modulator, and this aperture limits an area on the hologram recording medium irradiated by the recording beam.
  • diffractions from the spatial light modulator will be as follows: Specifically, 0-order diffraction which would appear on the optical axis disappears due to the phase shift mask. Further, ⁇ 1-order diffractions appear at locations closer to the optical axis than in a case where there is no phase shift mask provided. In other words, the optical axis and ⁇ 1-order diffractions are closer to each other than in the convention. Therefore, according to an embodiment of the present invention, even if the number of effective pixels of the spatial light modulator is increased, there is no need for e.g. the objective lens effective aperture to be increased as much. Thus, it is possible to increase the amount of recording in a hologram easily, without relying upon improvement in optical characteristics of the optical system such as the objective lens.
  • FIGS. 1 through 3 show a hologram recorder as an embodiment of the present invention.
  • a hologram recorder A includes a light source 1, a collimating lens 2, a first beam splitter 3, beam expanders 4A, 4B, a phase shift mask 5A, a spatial light modulator 5, a second beam splitter 6, relay lenses 7A, 7B, an objective lens 7, fixed mirrors 8A, 8B, 8C, a recording galvanometer mirror 9, recording condenser lenses 10A, 10B, a reproducing galvanometer mirror 11, reproducing condenser lenses 12A, 12B, and a photo detector 13.
  • the hologram recording medium B used in the hologram recorder A includes two protective layers 90A, 90B and a recording layer 91 sandwiched therebetween. Beams can be applied to the recording layer 91 from both sides. As the recording beam S and the reference beam R interfere with each other, a hologram is recorded in the recording layer 91.
  • a reference beam R is applied as indicated by broken lines, to the hologram recording medium B from the opposite side as was during the recording, and the beam from the hologram which interferes with the reference beam R travels to the objective lens 7 as a return beam.
  • the light source 1 which is provided by e.g. a semiconductor laser device, outputs a laser beam at the time of recording as well as reproducing.
  • the beam has a relatively narrow band and serves as a highly interfering coherent light.
  • the collimating lens 2 converts the laser beam from the light source 1 into a parallel light.
  • the laser beam from the collimating lens 2 travels to the first beam splitter 3.
  • the first beam splitter 3 splits the incoming laser beam into a recording beam S which travels to the spatial light modulator 5, and a reference beam R which travels through a different optical path to the recording and the reproducing galvanometer mirrors 9, 11.
  • the beam expanders 4A, 4B provided by combined lenses, expand the diameter of the recording beam S while introducing the recording beam S to the phase shift mask 5A and the spatial light modulator 5.
  • the phase shift mask 5A is provided on the light entering surface of the spatial light modulator 5. As shown in Fig. 2, the phase shift mask 5A has a dot matrix structure provided by two types of element which have different optical characteristics from each other; i.e. first transparent pixels 51 and second transparent pixels 52.
  • the first transparent pixels 51 provide apertures which simply allow the recording beam S to pass through whereas the second transparent pixels 52 are made of a phase film which gives the recording beam S a phase difference n while allowing the recording beam S to pass through.
  • These first transparent pixels 51 and the second transparent pixels 52 are alternated in vertical and horizontal directions, at a pixel pitch p of 10 through 20 ⁇ m approximately.
  • the spatial light modulator 5 provided by e.g. a liquid crystal display device, works at the time of recording, and modulates the incoming beam into a beam (recording beam S) which represents a two-dimensional pixel pattern.
  • the pixel pattern made by the spatial light modulator 5 is varied in accordance with the information to be recorded (See Fig. 2).
  • the recording beam S from the spatial light modulator 5 passes through the second beam splitter 6, travels to the relay lenses 7A, 7B and the objective lens 7, and finally reaches the hologram recording medium B, at which time, the recording beam S has a maximum spatial frequency to be transmitted by ⁇ 1-order diffractions D1 as shown in Fig. 3.
  • the beam passes through the relay lenses 7A, 7B and the objective lens 7.
  • An diaphragm 7C is provided on the Fourier plane F between the relay lenses 7A, 7B where the Fourier image is formed.
  • the diaphragm 7C limits the 2-order and higher-order diffractions, thereby limiting the area on the hologram recording medium B irradiated by the recording beam S.
  • Conventionally, such an diaphragm allows transmission up to the Nyquist spatial frequency of the spatial light modulator; however, the diaphragm 7C according to the present embodiment allows transmission of a spatial frequency which is a half of the Nyquist spatial frequency. Because of this arrangement, the area of the hologram recording medium B irradiated by the recording beam S is approximately a quarter of the conventional size.
  • the spatial light modulator 5 When reproducing, the spatial light modulator 5 is not operated so the recording beam S is not thrown onto the hologram recording medium B.
  • the relay lenses 7A, 7B and the objective lens 7 are disposed in such a way that the recording beam S enters the hologram recording medium B generally perpendicularly thereto (zero-degree angle of incidence).
  • the reference beam R from the first beam splitter 3 reflects on the fixed mirrors 8A, 8B and then travels to the recording galvanometer mirror 9.
  • the recording galvanometer mirror 9 is capable of varying the angle of incidence and the angle of reflection of the reference beam R at the time of recording, and allows the reference beam R to travel to the hologram recording medium B.
  • the reference beam R passes through the condenser lenses 10A, 10B, and irradiates the hologram recording medium B.
  • the reference beam R is applied so as to cross with the recording beam S on the recording layer 91 of the hologram recording medium B.
  • the recording galvanometer mirror 9 varies the angle of incidence of the reference beam R to the hologram recording medium B, whereby multiplex recording is made for holograms which have different interference patterns depending upon the angle of incidence.
  • the reference beam R When reproducing, the reference beam R reflects on the fixed mirror 8C and then travels to the reproducing galvanometer mirror 11.
  • the reproducing galvanometer mirror 11 is capable of varying the angle of incidence and the angle of reflection of the reference beam R at the time of reproducing, and allows the reference beam R to travel toward the hologram recording medium B from the opposite side as from the time of recording.
  • the reference beam R After the reproducing galvanometer mirror 11, the reference beam R passes through the condenser lenses 12A, 12B, and then irradiates the hologram recording medium B.
  • the reference beam R When reproducing, the reference beam R is applied so as to interfere with the recorded hologram on the recording layer 91 of the hologram recording medium B.
  • reproducing galvanometer mirror 11 operates so that the reproducing reference beam R is applied as a conjugated beam which has a reversed direction from the time of recording but has the same angle of incidence as in recording.
  • the return beam from the hologram has the same pixel pattern as did the recording beam S.
  • the photo detector 13 which is provided by a CCD area sensor or a CMOS area sensor works at the time of reproducing, to receive the return beam which comes back from the hologram recording medium B, through the objective lens 7 and the relay lenses 7A, 7B, and then to the second beam splitter 6.
  • the photo detector 13 as described provides a beam reception signal that corresponds to the pixel pattern represented by the return beam, and based on this beam reception signal, information which corresponds to the pixel pattern made at the time of recording is reproduced.
  • the recording beam S passes through the relay lenses 7A, 7B and the objective lens 7 as ⁇ 1-order diffractions D1 whereas 0-order diffraction disappears (See Fig. 3). This is due to optical characteristics of the phase shift mask 5A as will be described hereinafter.
  • ⁇ 1-order diffractions D1' appear at locations away from the optical axis by a distance T', on the Fourier plane F.
  • phase shift mask 5A makes the distance T between ⁇ 1-order diffractions D1 and the optical axis smaller than the distance T' which is the distance when no phase shift mask is provided.
  • the distance T is approximately a half of the distance T', and ⁇ 1-order diffractions D1 appear on the Fourier plane F, right in the middle between the optical axis and ⁇ 1-order diffractions D1' which is the diffractions appearing when there is no phase shift mask.
  • the objective lens 7 can now have the following optical characteristics: Specifically, it is now possible to make its angle of field (aperture angle) and effective aperture as small as possible. This means that increase in the amount of recording in a hologram can be achieved by increasing the number of effective pixels of the spatial light modulator 5, but without the need for as much increase in the effective aperture of the objective lens 7. With this arrangement used in the present embodiment, the number of effective pixels is increased by increasing the size of the entire pixel region without changing the pixel pitch of the spatial light modulator 5, thereby increasing the amount of recording in a hologram, differing clearly from the convention in Fig. 4.
  • the angle of field of the objective lens 7 is not very much increased over the convention, and therefore the effective aperture is appropriate.
  • the diffraction angle increases but the distance between ⁇ 1-order diffractions does not as much, due to the phase shift method theory. For this reason, it is also possible to decrease objective lens effective aperture as much as possible.
  • the recording beam S and the reference beam R which travel as described thus far interfere with each other at the recording layer 91, whereby a hologram is recorded in the recording layer 91.
  • the recording galvanometer mirror 9 is operated to set the reference beam R to different angles of incidence, whereby multiplex recording is made for different interference fringe patterns according to the angle of incidence of the reference beam R.
  • the reproducing galvanometer mirror 11 is operated to set the reference beam R at the same angle of incidence as at the time of recording.
  • the return beam from the hologram is received by the photo detector 13, and the information in the multiplex recording in the hologram is reproduced according to different angles of incidence.
  • the present invention is not limited to the embodiment described above.
  • the embodiment uses a transparent hologram recording medium B, and for this reason the direction of the reference beam for recording is opposite to the direction of the reference beam for reproducing.
  • the direction of the reference beam for recording is the same as the direction of the reference beam for reproducing, and the reference beam is applied from the same side as is the recording beam.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Signal Processing (AREA)
  • Holo Graphy (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
EP06250996A 2005-03-30 2006-02-24 Enregistreur d'hologrammes Withdrawn EP1708182A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005098124A JP2006276666A (ja) 2005-03-30 2005-03-30 ホログラム記録装置

Publications (2)

Publication Number Publication Date
EP1708182A2 true EP1708182A2 (fr) 2006-10-04
EP1708182A3 EP1708182A3 (fr) 2009-01-14

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Application Number Title Priority Date Filing Date
EP06250996A Withdrawn EP1708182A3 (fr) 2005-03-30 2006-02-24 Enregistreur d'hologrammes

Country Status (5)

Country Link
US (1) US20060221419A1 (fr)
EP (1) EP1708182A3 (fr)
JP (1) JP2006276666A (fr)
KR (1) KR100777911B1 (fr)
CN (1) CN100390873C (fr)

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KR100777911B1 (ko) 2007-11-21
CN1841525A (zh) 2006-10-04
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